Package com.thebuzzmedia.exiftool

Interface ExecutionStrategy

All Superinterfaces:

AutoCloseable

All Known Implementing Classes:

DefaultStrategy, PoolStrategy, StayOpenStrategy

public interface ExecutionStrategy
extends AutoCloseable

ExifTool execution strategy.
For instance:

• Execution using a one-shot process.
• Execution using stay_open flag: this strategy means that a process is started and re-used for next executions.

Each implementation will define the main logic for reading and writing metadata (this is the main purpose for the execute(com.thebuzzmedia.exiftool.process.CommandExecutor, java.lang.String, java.util.List<java.lang.String>, com.thebuzzmedia.exiftool.process.OutputHandler) method.
Implementation should also define a close method: this method will be used to stop remaining process and clean previous execution. Calling close() method should not prevent instances to be used for a next execution.

Method Summary

Modifier and Type	Method	Description
void	close()	This method should be used to: Close remaining process (if any). Clean previous executions. For instance, with the stay_open flag, this method should: Close opened process. Stop task used to automatically close process. Once closed, ExifTool should still be able to use this strategy if a call to execute(com.thebuzzmedia.exiftool.process.CommandExecutor, java.lang.String, java.util.List<java.lang.String>, com.thebuzzmedia.exiftool.process.OutputHandler) is made.
void	execute(CommandExecutor executor, String exifTool, List<String> arguments, OutputHandler handler)	Execute exiftool command.
boolean	isRunning()	Check if exiftool process is currently running.
boolean	isSupported(Version version)	Check if this strategy should is supported with this specific version.
void	shutdown()	Shutdown the strategy.

Method Details

execute

void execute(CommandExecutor executor,
 String exifTool,
 List<String> arguments,
 OutputHandler handler)
      throws IOException

Execute exiftool command.

Parameters:

executor - ExifTool withExecutor.

exifTool - ExifTool withPath.

arguments - Command line arguments.

handler - Handler to read command output.

Throws:

IOException - If an error occurred during execution.

isRunning

boolean isRunning()

Check if exiftool process is currently running. This method is important especially if stay_open flag has been enabled.

Returns:

true if exiftool process is currently open, false otherwise.

isSupported

boolean isSupported(Version version)

Check if this strategy should is supported with this specific version.

Parameters:

version - ExifTool Version.

Returns:

true if this strategy may be used safely with this specific version, false otherwise.

close

void close()
    throws Exception

This method should be used to:

• Close remaining process (if any).
• Clean previous executions.

For instance, with the stay_open flag, this method should:

• Close opened process.
• Stop task used to automatically close process.

Once closed, ExifTool should still be able to use this strategy if a call to execute(com.thebuzzmedia.exiftool.process.CommandExecutor, java.lang.String, java.util.List<java.lang.String>, com.thebuzzmedia.exiftool.process.OutputHandler) is made.

Specified by:

close in interface AutoCloseable

Throws:

Exception - If an error occurred while stopping exiftool client.

shutdown

void shutdown()
       throws Exception

Shutdown the strategy.

Throws:

Exception - If an error occurred while stopping exiftool client.